CN114336642A - Bilateral power supply ride-through power utilization system of traction network and control method - Google Patents
Bilateral power supply ride-through power utilization system of traction network and control method Download PDFInfo
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- CN114336642A CN114336642A CN202210261871.3A CN202210261871A CN114336642A CN 114336642 A CN114336642 A CN 114336642A CN 202210261871 A CN202210261871 A CN 202210261871A CN 114336642 A CN114336642 A CN 114336642A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M3/00—Feeding power to supply lines in contact with collector on vehicles; Arrangements for consuming regenerative power
- B60M3/06—Arrangements for consuming regenerative power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The invention provides a system for utilizing bilateral power supply ride-through power of a traction network and a control method, and relates to the technical field of electrified railway power supply. The system comprises a power conversion device BCSa and a controller CCa which are arranged on a substation TSa, a power conversion device BCSb and a controller CCb which are arranged on a substation TSb, and an OCS (online charging system) between the substation TSa and the substation TSb adopts bilateral power supply; the controller CCa is used for acquiring the power information of the substation TSa in real time, and the controller CCb is used for acquiring the power information of the substation TSb in real time; the controller CCa and the controller CCb carry out information interaction on the OFL through the optical fiber, the controller CCa controls the power conversion device BCSa to utilize the traversing power according to the information interaction result or the controller CCb controls the power conversion device BCSb to utilize the traversing power according to the information interaction result, and the traversing power returned to the power grid meets the preset requirement.
Description
Technical Field
The invention relates to the technical field of alternating current electrified railway traction power supply, in particular to a system for utilizing bilateral power supply ride-through power of a traction network and a control method.
Background
The electric split phase of the electrified railway is a weak link in the whole traction power supply system, a neutral section of the electric split phase forms a dead zone, so that power supply interruption is caused, although the dead zone of the neutral section is only dozens of meters generally, the power-off distance of the train for controlling the automatic passing split phase reaches more than 500 meters, the good running of the train is severely restricted, and even the accident of train slope stop is caused when the train goes up a slope. The bilateral power supply of the electrified railway can cancel the electric phase separation of the subareas, eliminate the dead zones, ensure the uninterrupted power supply of the train and eliminate the potential danger of passing the neutral zone. The bilateral power supply has the advantages of high power supply reliability, good network voltage level, high power supply capacity, low power loss and the like.
Normally, a bilateral power supply traction network and a power grid form a parallel structure through traction substations on two sides, when the traction network is in no-load, power and current flow through the traction network, the corresponding power is called through power (the corresponding current is called balanced current), at the moment, the through power flows in from the traction substation on one side and flows out from the traction substation on the other side, namely, the traction substation where the through power flows into the traction network from the power grid is in a load (power utilization) state, and the traction substation where the through power flows into the power grid from the traction network is in a power generation state. Just because bilateral power supply has changed the electric wire netting structure, two key technical problems need to be solved in the implementation bilateral power supply: the relay protection problem of the power grid and the traction network needs relay protection, has a larger protection range, has the function of blocking tidal current transmission by connecting and tripping the traction network when the power grid fails, and the like, and can be completely solved by equipping the power grid with power transmission line protection, the traction network with segment protection, and the like; and secondly, the influence and the metering problem of the crossing power on the power grid are solved, if the crossing power returns to the power grid, the power generation of the traction substation is equivalent, if the crossing power is returned to the power grid, the power consumption of the other traction substation is counteracted, the user has no economic loss, if the crossing power is returned to the power grid, the power consumption is not counted or is counted, the economic loss of the user is caused, under the condition, the research on how to reduce the crossing power by bilateral power supply or how to utilize the crossing power is needed, the influence on the power grid and the user is reduced while the advantage of bilateral power supply is normally exerted, and the power consumption benefit is improved.
In consideration of the problem that the key point of bilateral power supply ride-through power is power returned to a power grid, the bilateral power supply ride-through power utilization technology of the traction network of the electrified railway is provided, the electric phase splitting in a subarea is cancelled, a dead zone is eliminated, meanwhile, ride-through power is converted into available power and electric energy, and the power returned to the power grid meets the requirement and is even 0.
Disclosure of Invention
The invention aims to provide a traction network bilateral power supply ride-through power utilization system which can effectively utilize ride-through power existing between a substation TSa and a substation TSb, so that the ride-through power returned to a power grid meets a preset requirement.
The invention is realized by the following technical means:
a bilateral power supply ride-through power utilization system of a traction network comprises a power conversion device BCSa and a controller CCa, wherein the power conversion device BCSa is arranged in a traction substation TSa and is connected with a traction bus TSBa through an alternating current port Ja; the traction bus TSBa is provided with a voltage transformer PTA, and the traction feeder Fa1 and the traction feeder Fa2 are respectively provided with a current transformer CTa1 and a current transformer CTa 2; the measuring ends of the voltage transformer PTA, the current transformer CTa1 and the current transformer CTa2 are connected with the input end of the controller CCa;
the system also comprises a power conversion device BCSb and a controller CCb which are arranged on the traction substation TSb, wherein the power conversion device BCSb is connected with the traction bus TSBb through an alternating current port Jb; the traction bus TSBb is provided with a voltage transformer PTb, and the traction feeder Fb1 and the traction feeder Fb2 are respectively provided with a current transformer CTb1 and a current transformer CTb 2; the measuring ends of the voltage transformer PTb, the current transformer CTb1 and the current transformer CTb2 are connected with the input end of the controller CCb;
the controller CCa and the controller CCb are connected with each other through an optical fiber pair OFL and carry out information interaction, wherein: a traction network OCS between a traction substation TSa and a traction substation TSb adopts bilateral power supply; the controller CCa is used for acquiring the power information of the substation TSa in real time, and the controller CCb is used for acquiring the power information of the substation TSb in real time; and the controller CCa and the controller CCb respectively control the power conversion device BCSa and the power conversion device BCSb to utilize the crossing power according to the information interaction result, so that the crossing power returned from the traction substation TSa or the traction substation TSb to the power grid meets the preset requirement.
Furthermore, the traction substation TSa adopts in-phase power supply, a traction bus TSBa of the traction substation TSa supplies power to the traction network OCS through a traction feeder Fa1, the traction network OCSA supplies power to the left adjacent power supply section through a traction feeder Fa2, and the traction network OCS is connected with the left adjacent power supply section traction network OCSA through a sectionalizer.
Furthermore, the traction substation TSb adopts in-phase power supply, a traction bus TSBb of the traction substation TSb supplies power to the traction network OCS through a traction feeder Fb1, power is supplied to the traction network OCSB in the right adjacent power supply interval through a traction feeder Fb2, and the traction network OCS is connected with the traction network OCSB in the right adjacent power supply interval through a sectionalizer.
Further, the power conversion device BCSa comprises a rectifying device ADCa and an inverter device DACa, a dc side of the rectifying device ADCa is connected with the energy storage device ESDa and a dc side of the inverter device DACa through a common dc bus DCBa, a three-phase dc side of the inverter device DACa is connected with a distribution system bus DSBa of the traction substation TSa, and an output end of the controller CCa is connected with a control end of the power conversion device BCSa.
Further, the power conversion device BCSb includes a rectifier device ADCb and an inverter device DACb, a dc side of the rectifier device ADCb is connected to the energy storage device ESDb and a dc side of the inverter device DACb through a common dc bus DCBb, a three-phase dc side of the inverter device DACb is connected to a distribution system bus DSBb of the traction substation TSb, and an output end of the controller CCb is connected to a control end of the power conversion device BCSb.
Another object of the present invention is to provide a control method based on the above system for bilateral power supply across power utilization of a traction network, including:
the controller CCa and the controller CCb respectively acquire real-time power information of the traction substation TSa and the traction substation TSb;
the controller CCa and the controller CCb carry out information interaction according to the acquired real-time power information;
the controller CCa controls the power conversion device BCSa to utilize the crossing power according to the information interaction result, and the controller CCb controls the power conversion device BCSb to utilize the crossing power according to the information interaction result, so that the crossing power returned from the traction substation TSa to the power grid or the crossing power returned from the traction substation TSb to the power grid meets the preset requirement.
Further, the traction substation TSa and the traction substation TSb both adopt the same-phase power supply, and in the control method:
the step of acquiring the real-time power information of the traction substation TSa by the controller CCa comprises the following steps: the controller CCa detects the voltage Ua of the traction bus TSBa, the current Ia1 of the traction feeder Fa1 and the current Ia2 of the traction feeder Fa2 in real time; the controller CCa calculates active power Pca provided by the traction substation TSa to the traction network OCS according to the voltage Ua of the traction bus TSBa and the current Ia1 of the traction feeder Fa 1; the controller CCa calculates active power Pcaa provided by the traction substation TSa to the left adjacent power supply section traction network OCSA according to the voltage Ua of the traction bus TSBa and the current Ia2 of the traction feeder Fa 2;
the step of acquiring the real-time power information of the substation TSb by the controller CCb comprises the following steps: the controller CCb detects the voltage Ub of the traction bus TSBb, the current Ib1 of the traction feeder Fb1 and the current Ib2 of the traction feeder Fb2 in real time; the controller CCb calculates active power Pcb provided by the traction substation TSb to the traction network OCS according to the voltage Ub of the traction bus TSBb and the current Ib1 of the traction feeder Fb1, and the controller CCb calculates active power Pcbb provided by the traction substation TSb to the traction network OCSB in the right adjacent power supply section according to the voltage Ub of the traction bus TSBb and the current Ib2 of the traction feeder Fb 2;
the power flowing to the traction network by the traction substation is positive, and the power flowing to the traction substation by the traction network is negative.
Further, the information interaction between the controller CCa and the controller CCb according to the respective acquired real-time power information includes: the controller CCa sends the active power Pca and the active power Pcaa data to the controller CCb through the optical fiber pair OFL, and the controller CCb sends the active power Pcb and the active power Pcbb data to the controller CCa through the optical fiber pair OFL.
Further, the step of controlling, by the controller CCa, the power conversion device BCSa to use the cross power according to the information interaction result, and controlling, by the controller CCb, the power conversion device BCSb to use the cross power according to the information interaction result, so that the cross power returned from the traction substation TSa to the grid or the cross power returned from the traction substation TSb to the grid meets the preset requirement includes:
if Pca >0 and Pcb <0 and Pca + Pcb =0, the controller CCa and controller CCb determine that the traction network OCS is in the idle condition, the active power Pca and the active power Pcb are ride-through power and flow from the traction feeder Fa1 to the traction feeder Fb1, when: if the active power Pca is more than or equal to Pcbb and more than or equal to 0, the controller CCb controls the power conversion device BCSb to supply power to the distribution system bus DSBb or enables the energy storage device ESDb to operate in an energy storage state, the sum of the power of the controller CCb and the power of the energy storage device ESDb is = Pca-Pcbb, and meanwhile the controller CCa controls the power conversion device BCSa to be in standby; if the active power Pcbb is larger than or equal to Pca, the controller CCb controls the power conversion device BCSb to be in standby, and meanwhile, the controller CCa controls the power conversion device BCSa to be in standby;
if Pcb >0 and Pca <0 and Pca + Pcb =0, controller CCa and controller CCb determine that the traction network OCS is in the idle condition, active power Pca and active power Pcb are ride-through power and flow from traction feed Fb1 to traction feed Fa1, when: if the active power Pcb is larger than or equal to Paaa and larger than or equal to 0, the controller CCa controls the power conversion device BCSa to supply power to the distribution system bus DSBa or enables the energy storage device ESDa to operate in an energy storage state; when the sum of the two powers = Pb-Pcaa, the controller CCb controls the power conversion apparatus BCSb to stand by; if the active power Pcaa is larger than or equal to Pcb, the controller CCa controls the power conversion device BCSa to stand by, and meanwhile, the controller CCb controls the power conversion device BCSb to stand by;
if the absolute value of Pca + Pcb is greater than 0, and Pca is greater than 0 and Pcb is greater than 0, the controller CCa and the controller CCb judge that the OCS is in the traction working condition, the controller CCa controls the power conversion device BCSa to enable the energy storage device ESDa to operate in the discharge state, the discharge power of the energy storage device ESDa is less than or equal to Pca, meanwhile, the controller CCb controls the power conversion device BCSb to enable the energy storage device ESDb to operate in the discharge state, and the discharge power of the energy storage device ESDb is less than or equal to Pcb.
Further, the step that the controller CCa controls the power conversion device BCSa to use the cross power according to the information interaction result, and the step that the controller CCb controls the power conversion device BCSb to use the cross power according to the information interaction result, so that the cross power returned from the traction substation TSa to the grid or the cross power returned from the traction substation TSb to the grid meets the preset requirement further comprises:
if Pca <0 and Pcb <0, controller CCa and controller CCb determine that the OCS is in the braking condition, at which time:
if Pcaa is less than 0, the controller CCa controls the power conversion device BCSa to supply power to the distribution system bus DSBa or to enable the energy storage device ESDa to operate in an energy storage state, and the sum of the power of the two is = | Pca | + | Pcaa |; if Pcaa >0 and Pcaa < | Pcaa |, the controller CCa controls the power conversion device BCSa to supply power to the distribution system bus DSBa or to operate the energy storage device ESDa in an energy storage state, and the sum of the power of the two is = | Pcaa | - | Pcaa |; if Pcaa is greater than 0 and Pcaa is greater than or equal to | Pca |, the controller CCa controls the power conversion device BCSa to be in standby;
if Pcbb is less than 0, the controller CCb controls the power conversion device BCSb to supply power to the distribution system bus DSBb or enables the energy storage device ESDb to operate in an energy storage state, and the sum of the power conversion device BCSb and the energy storage device ESDb is = | Pcb | + | Pcbb |; if Pcbb is greater than 0 and Pcbb is less than | Pcb |, the controller CCb controls the power conversion device BCSb to supply power to the distribution system bus DSBb or enables the energy storage device ESDb to operate in an energy storage state, and the sum of the power of the two is = | Pcb | - | Pcbb |; if Pcbb is larger than 0 and Pcbb is larger than or equal to | Pcb |, the controller CCb controls the power conversion device BCSa to be in standby.
The working principle of the invention is as follows: in general, a bilateral supply traction network and a power grid form a parallel structure, when the traction network is unloaded, a part of power transmitted by the power grid flows through the traction network, and the corresponding power is called through power (the corresponding current is called equilibrium current). The distributed capacitance of the transmission line and the traction network also generates charging current and charging power. The traversing power flows along the traction network, belonging to the longitudinal component, whereas the charging power, like the load, is called the transverse component. When the traction network is in no-load, the active component of the measured traversing power can be selected to reflect the traversing condition, and the active component can be measured at any convenient part of the incoming line of the traction substation, the traction feeder line and the traction network. The in-phase power supply of the traction substation and the bilateral power supply of the traction network are equivalent to the extension of a power supply arm, and a traction train in the same-running train can absorb the regenerative power of a braking train at a higher probability, so that the regenerative power finally returned to the power network is greatly reduced and even reaches 0. If the traction load generates a larger transverse component which is equal to or larger than the value of the passing power returned to the power grid, only the transverse component effect is shown, namely the equivalent traction working condition is obtained. If the load of the traction network is in a regenerative braking working condition, the generated regenerative braking energy is firstly absorbed by the adjacent power supply interval, and the redundant regenerative energy can be fed back to the power network through the traction substation. The method comprises the following steps of judging the operation condition of a traction network in a bilateral power supply interval by utilizing voltage and current information of two traction substations in bilateral power supply: under the no-load working condition, the power conversion device is used for storing the ride-through power in the energy storage device or converting the ride-through power into a self-power utilization system of the substation, so that the ride-through power returned to the power grid meets the preset requirement; under the traction working condition (or equivalent traction working condition), the energy storage device releases energy for the train to use; under the condition of regenerative braking (at the moment, ride-through power also exists), the regenerative power and the ride-through power are stored in the energy storage device or are converted into a self-power utilization system of the substation through the power conversion device, so that the power returned to the power grid meets the preset requirement.
Compared with the prior art, the invention has the beneficial effects that:
under the condition of not changing the railway power supply structure of the power grid, the crossing power of the traction network is utilized, the negative influence of the crossing power on the power grid and users is eliminated, and the advantage of bilateral power supply is fully exerted.
And secondly, bilateral power supply is implemented on the basis of in-phase power supply, so that the utilization of regenerated energy of a power supply arm is facilitated, the direct utilization rate of regenerated braking energy is improved, and the regenerated power and electric energy returned to a power grid can meet preset requirements and even can be reduced to 0 under the common condition.
And thirdly, the power conversion device can be connected with an energy storage device of the traction substation and a power distribution system for supplying power, and can utilize residual regenerative braking electric energy besides the crossing power.
Fourthly, the technology is advanced, reliable and easy to implement.
Drawings
Fig. 1 is a schematic diagram of the connection relationship between the bilateral power supply and the power grid according to the present invention.
FIG. 2 is a schematic view of the structure of the present invention.
Fig. 3 is a schematic structural diagram of a power conversion apparatus BCSa according to the present invention.
FIG. 4 is a schematic structural diagram of a power conversion device BCSb according to the present invention
FIG. 5 is a flow chart of a control method according to the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, those skilled in the art will further describe the present invention with reference to the accompanying drawings and the detailed description.
Example 1
A single-line schematic diagram of a connection relation between the bilateral power supply and the power grid is shown in fig. 1, and the bilateral power supply traction network OCS forms a parallel structure with the power grid G through the traction substation TSa and the traction substation TSb on the two sides. According to the parallel shunt principle, the bilateral power supply can generate a current component parallel to the power grid G in the traction network OCS, namely a balanced current, and generates through power, so that the electric quantity charging problem of the railway is influenced. If the charge of the primary side electric quantity of the two electric substations with the power supplied from the two sides adopts a return-to-counter mode, the problem can be well solved, and if the charge is not counted by return or is counted by return, the charge becomes an extra burden of a railway. For this purpose,
as shown in fig. 2, the present embodiment provides a system for utilizing bilateral power supply across power of a traction grid, including a power conversion device BCSa and a controller CCa, which are disposed in a traction substation TSa, where the power conversion device BCSa is connected to a traction bus TSBa through an ac port Ja; the traction bus TSBa is provided with a voltage transformer PTA, and the traction feeder Fa1 and the traction feeder Fa2 are respectively provided with a current transformer CTa1 and a current transformer CTa 2; the measuring ends of the voltage transformer PTA, the current transformer CTa1 and the current transformer CTa2 are connected with the input end of the controller CCa;
the system also comprises a power conversion device BCSb and a controller CCb which are arranged on the traction substation TSb, wherein the power conversion device BCSb is connected with the traction bus TSBb through an alternating current port Jb; the traction bus TSBb is provided with a voltage transformer PTb, and the traction feeder Fb1 and the traction feeder Fb2 are respectively provided with a current transformer CTb1 and a current transformer CTb 2; the measuring ends of the voltage transformer PTb, the current transformer CTb1 and the current transformer CTb2 are connected with the input end of the controller CCb;
the controller CCa and the controller CCb are connected with each other through an optical fiber pair OFL and carry out information interaction, wherein: a traction network OCS between a traction substation TSa and a traction substation TSb adopts bilateral power supply; the controller CCa is used for acquiring the power information of the substation TSa in real time, and the controller CCb is used for acquiring the power information of the substation TSb in real time; and the controller CCa and the controller CCb respectively control the power conversion device BCSa and the power conversion device BCSb to utilize the crossing power according to the information interaction result, so that the crossing power returned from the traction substation TSa or the traction substation TSb to the power grid meets the preset requirement.
In the application scenario of this embodiment, the electrical phase splitting between the traction substation TSa and the traction substation TSb is cancelled, that is, the traction network OCS between the traction substation TSa and the traction substation TSb adopts the bilateral power supply, and meanwhile, the aforementioned prior art needs to serially connect the reactor on the secondary side of the traction transformer of the traction substation to reduce the balanced current, or the traction substation is additionally provided with the voltage compensation device to implement the voltage phase compensation to reduce the voltage difference output by the two traction substations with bilateral power supply, and this embodiment does not impose the requirement on the two measures, that is, this embodiment may adopt the two measures or not adopt the two measures, and the core of this embodiment lies in utilizing the crossing power or the power returning to the traction substation with the crossing power, and emphasizes the processing after the result of the occurrence of the crossing power rather than inhibiting the generation of the crossing power, in addition, on the basis of the technical concept of utilizing the traversing power, in the embodiment, because the regenerative power generated during train braking and the originally existing traversing power return to the traction substation together in the actual working condition, the utilization of the traversing power in the embodiment may also refer to the utilization of the power of the return traction substation containing the traversing power, and the traversing power is utilized, so that the traversing power returning from the traction substation TSa to the power grid or the traversing power returning from the traction substation TSb to the power grid meets the preset requirement, thereby eliminating the negative influence of the traversing power on the power grid and users, and fully exerting the advantage of bilateral power supply.
Preferably, the traction substation TSa in this embodiment adopts in-phase power supply, the traction bus TSBa of the traction substation TSa supplies power to the traction network OCS through the traction feeder Fa1, and supplies power to the left adjacent power supply section traction network OCSa through the traction feeder Fa2, and the traction network OCS and the left adjacent power supply section traction network OCSa are connected through a sectionalizer.
Here, after the in-phase power supply technology is adopted by the substation TSa, the power supply arm is extended, the traction train in the same-phase train can absorb the regenerative power of the braking train with a higher probability, the direct utilization rate of regenerative braking energy is improved, and the regenerative power finally returned to the power grid is greatly reduced and even reaches 0. For convenience of maintenance, in this embodiment, an electrical segment may be set at the traction network of the traction substation TSa, that is, an electrical segment is set between the traction network OCS and the traction network OCSa in the left adjacent power supply interval, and the electrical segment is set, so that on one hand, a segment measurement and control protection technology may be used in cooperation, so that maintenance and repair are facilitated while a train passes through without power failure, and on the other hand, the operation condition of the traction network OCS may be detected and analyzed in cooperation with the electrical segment set at the substation TSb (including detecting and analyzing whether the traction network OCS is in an idle state, where the power returned to the substation during the idle state is the crossing power, and specific analysis may refer to embodiment 2).
Preferably, the traction substation TSb in this embodiment adopts in-phase power supply, the traction bus TSBb of the traction substation TSb supplies power to the traction network OCS through the traction feeder Fb1, supplies power to the right adjacent power supply section traction network OCSb through the traction feeder Fb2, and connects the traction network OCS and the right adjacent power supply section traction network OCSb through the sectionalizer.
Here, after the in-phase power supply technology is adopted by the substation TSb, the power supply arm is extended, and the traction train in the same-phase train can absorb the regenerative power of the braking train with a higher probability, so that the direct utilization rate of regenerative braking energy is improved, and the regenerative power finally returned to the power grid is greatly reduced, even to 0. For convenience of maintenance, in this embodiment, an electrical segment may be set at the traction network of the substation TSb, that is, an electrical segment is set between the traction network OCS and the right adjacent power supply interval traction network OCSb, and the electrical segment is set, so that on one hand, a segment measurement and control protection technology may be used in cooperation, so that maintenance and repair are facilitated while a train passes through without power failure, and on the other hand, the operation condition of the traction network OCS may also be detected and analyzed in cooperation with the electrical segment set at the traction substation TSa (including detecting and analyzing whether the traction network OCS is in an idle state, where the power returned to the substation during the idle state is the crossing power, and specific analysis may refer to embodiment 2).
Preferably, as shown in fig. 3, the power conversion device BCSa includes a rectifier device ADCa and an inverter device DACa, a dc side of the rectifier device ADCa is connected to the energy storage device ESDa and a dc side of the inverter device DACa through a common dc bus DCBa, a three-phase dc side of the inverter device DACa is connected to a distribution system bus DSBa of the traction substation TSa, and an output end of the controller CCa is connected to a control end of the power conversion device BCSa.
Here, when the cross power or the return power including the cross power flows to the traction substation TSa, the controller CCa may control the energy storage device ESDa to store the cross power or the return power including the cross power flowing to the traction substation TSa, and may also control the cross power or the return power including the cross power flowing to the traction substation TSa to flow to the distribution system bus DSBa to be utilized by the electrical equipment related to the distribution system, so that the cross power returning from the substation TSa to the grid satisfies the preset requirement.
Preferably, as shown in fig. 4, the power conversion device BCSb includes a rectifier device ADCb and an inverter device DACb, a dc side of the rectifier device ADCb is connected to the energy storage device ESDb and a dc side of the inverter device DACb through a common dc bus DCBb, a three-phase dc side of the inverter device DACb is connected to a distribution system bus DSBb of the traction substation TSb, and an output terminal of the controller CCb is connected to a control terminal of the power conversion device BCSb.
Here, when the cross power or the return power including the cross power flows to the substation TSb, the controller CCb may control the energy storage device ESDb to store the cross power or the return power including the cross power flowing to the substation TSb, and may also control the cross power or the return power including the cross power flowing to the substation TSb to flow to the distribution system bus DSBb to be utilized by the distribution system related electrical device, so that the cross power returning to the grid from the substation TSb satisfies a preset requirement.
Example 2
As shown in fig. 5, this embodiment provides a control method for a system for bilateral power supply cross-over of a traction network provided in embodiment 1, including:
step S100: the controller CCa and the controller CCb respectively acquire real-time power information of the traction substation TSa and the traction substation TSb;
step S200: the controller CCa and the controller CCb carry out information interaction according to the acquired real-time power information;
step S300: the controller CCa controls the power conversion device BCSa to utilize the crossing power according to the information interaction result, and the controller CCb controls the power conversion device BCSb to utilize the crossing power according to the information interaction result, so that the crossing power returned from the traction substation TSa to the power grid or the crossing power returned from the traction substation TSb to the power grid meets the preset requirement.
Preferably, the traction substation TSa and the traction substation TSb both use in-phase power supply, and in the method:
the controller CCa and the controller CCb respectively obtain the real-time power information of the traction substation TSa and the traction substation TSb, that is, the step S100 includes: the controller CCa detects the voltage Ua of the traction bus TSBa, the current Ia1 of the traction feeder Fa1 and the current Ia2 of the traction feeder Fa2 in real time; the controller CCa calculates active power Pca provided by the traction substation TSa to the traction network OCS according to the voltage Ua of the traction bus TSBa and the current Ia1 of the traction feeder Fa 1; the controller CCa calculates active power Pcaa provided by the traction substation TSa to the left adjacent power supply section traction network OCSA according to the voltage Ua of the traction bus TSBa and the current Ia2 of the traction feeder Fa 2;
the controller CCb detects the voltage Ub of the traction bus TSBb, the current Ib1 of the traction feeder Fb1 and the current Ib2 of the traction feeder Fb2 in real time; the controller CCb calculates active power Pcb provided by the traction substation TSb to the traction network OCS according to the voltage Ub of the traction bus TSBb and the current Ib1 of the traction feeder Fb1, and the controller CCb calculates active power Pcbb provided by the traction substation TSb to the traction network OCSB in the right adjacent power supply section according to the voltage Ub of the traction bus TSBb and the current Ib2 of the traction feeder Fb 2;
the power flowing to the traction network by the traction substation is positive, and the power flowing to the traction substation by the traction network is negative.
Here, the fact that the power flowing from the traction substation to the traction network is positive means that the power flowing from the traction substation TSa to the traction network OCS or the left adjacent power supply section traction network OCSa is positive, and means that the power flowing from the traction substation TSb to the traction network OCS or the right adjacent power supply section traction network OCSb is positive; the fact that the power flowing from the traction network to the traction substation is negative means that the power flowing from the traction network OCS or the left adjacent power supply interval traction network OCSA to the traction substation TSa is negative, and means that the power flowing from the traction network OCS or the right adjacent power supply interval traction network OCSB to the traction substation TSb is negative.
Preferably, the controller CCa and the controller CCb perform information interaction according to the respective power information acquired in real time, that is, step S200 includes: the information interaction between the controller CCa and the controller CCb according to the acquired real-time power information comprises the following steps: the controller CCa sends the active power Pca and the active power Pcaa data to the controller CCb through the optical fiber pair OFL, and the controller CCb sends the active power Pcb and the active power Pcbb data to the controller CCa through the optical fiber pair OFL.
Preferably, the controller CCa controls the power conversion device BCSa to use the cross power according to the information interaction result, and the controller CCb controls the power conversion device BCSb to use the cross power according to the information interaction result, so that the cross power returned from the traction substation TSa to the grid or the cross power returned from the traction substation TSb to the grid meets the preset requirement, that is, step S300 includes:
step S301: if Pca >0 and Pcb <0 and Pca + Pcb =0, the controller CCa and controller CCb determine that the traction network OCS is in the idle condition, the active power Pca and the active power Pcb are ride-through power and flow from the traction feeder Fa1 to the traction feeder Fb1, when: if the active power Pca is larger than or equal to Pcbb and larger than or equal to 0, the controller CCb controls the power conversion device BCSb to supply power to the distribution system bus DSBb or enables the energy storage device ESDb to operate in an energy storage state; when the sum of the two powers = Pca-Pcbb, the controller CCa controls the power conversion device BCSa to be in standby; if the active power Pcbb is larger than or equal to Pca, the controller CCb controls the power conversion device BCSb to be in standby, and meanwhile, the controller CCa controls the power conversion device BCSa to be in standby;
step S302: if Pcb >0 and Pca <0 and Pca + Pcb =0, controller CCa and controller CCb determine that the traction network OCS is in the idle condition, active power Pca and active power Pcb are ride-through power and flow from traction feed Fb1 to traction feed Fa1, when: if the active power Pcb is larger than or equal to Paaa and larger than or equal to 0, the controller CCa controls the power conversion device BCSa to supply power to the power distribution system bus DSBa or enables the energy storage device ESDa to operate in an energy storage state, the sum of the power of the controller CCa and the power storage device ESDa is = Pb-Paaa, and meanwhile the controller CCb controls the power conversion device BCSb to be in a standby state; if the active power Pcaa is larger than or equal to Pcb, the controller CCa controls the power conversion device BCSa to stand by, and meanwhile, the controller CCb controls the power conversion device BCSb to stand by;
step S303: if the absolute value of Pca + Pcb is greater than 0, and Pca is greater than 0 and Pcb is greater than 0, the controller CCa and the controller CCb judge that the OCS is in the traction working condition, the controller CCa controls the power conversion device BCSa to enable the energy storage device ESDa to operate in the discharge state, the discharge power of the energy storage device ESDa is less than or equal to Pca, meanwhile, the controller CCb controls the power conversion device BCSb to enable the energy storage device ESDb to operate in the discharge state, and the discharge power of the energy storage device ESDb is less than or equal to Pcb.
Preferably, the controller CCa controls the power conversion device BCSa to use the cross power according to the information interaction result, and the controller CCb controls the power conversion device BCSb to use the cross power according to the information interaction result, so that the cross power returned from the traction substation TSa to the grid or the cross power returned from the traction substation TSb to the grid meets the preset requirement, that is, the step 300 further includes:
step S304: if Pca <0 and Pcb <0, controller CCa and controller CCb determine that the OCS is in the braking condition, at which time:
step S304-1: if Pcaa is less than 0, the controller CCa controls the power conversion device BCSa to supply power to the distribution system bus DSBa or to enable the energy storage device ESDa to operate in an energy storage state, and the sum of the power of the two is = | Pca | + | Pcaa |; if Pcaa >0 and Pcaa < | Pcaa |, the controller CCa controls the power conversion device BCSa to supply power to the distribution system bus DSBa or to operate the energy storage device ESDa in an energy storage state, and the sum of the power of the two is = | Pcaa | - | Pcaa |; if Pcaa is greater than 0 and Pcaa is greater than or equal to | Pca |, the controller CCa controls the power conversion device BCSa to be in standby;
step S304-2: if Pcbb is less than 0, the controller CCb controls the power conversion device BCSb to supply power to the distribution system bus DSBb or enables the energy storage device ESDb to operate in an energy storage state, and the sum of the power conversion device BCSb and the energy storage device ESDb is = | Pcb | + | Pcbb |; if Pcbb is greater than 0 and Pcbb is less than | Pcb |, the controller CCb controls the power conversion device BCSb to supply power to the distribution system bus DSBb or enables the energy storage device ESDb to operate in an energy storage state, and the sum of the power of the two is = | Pcb | - | Pcbb |; if Pcbb is larger than 0 and Pcbb is larger than or equal to | Pcb |, the controller CCb controls the power conversion device BCSa to be in standby.
The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and these modifications and adaptations should be considered within the scope of the invention.
Claims (10)
1. A bilateral power supply ride-through power utilization system of a traction network is characterized in that:
the system comprises a power conversion device BCSa and a controller CCa, wherein the power conversion device BCSa is arranged in a traction substation TSa and is connected with a traction bus TSBa through an alternating current port Ja; the traction bus TSBa is provided with a voltage transformer PTA, and the traction feeder Fa1 and the traction feeder Fa2 are respectively provided with a current transformer CTa1 and a current transformer CTa 2; the measuring ends of the voltage transformer PTA, the current transformer CTa1 and the current transformer CTa2 are connected with the input end of the controller CCa;
the system also comprises a power conversion device BCSb and a controller CCb which are arranged on the traction substation TSb, wherein the power conversion device BCSb is connected with the traction bus TSBb through an alternating current port Jb; the traction bus TSBb is provided with a voltage transformer PTb, and the traction feeder Fb1 and the traction feeder Fb2 are respectively provided with a current transformer CTb1 and a current transformer CTb 2; the measuring ends of the voltage transformer PTb, the current transformer CTb1 and the current transformer CTb2 are connected with the input end of the controller CCb;
the controller CCa and the controller CCb are connected with each other through an optical fiber pair OFL and carry out information interaction, wherein: a traction network OCS between a traction substation TSa and a traction substation TSb adopts bilateral power supply; the controller CCa is used for acquiring the power information of the substation TSa in real time, and the controller CCb is used for acquiring the power information of the substation TSb in real time; and the controller CCa and the controller CCb respectively control the power conversion device BCSa and the power conversion device BCSb to utilize the crossing power according to the information interaction result, so that the crossing power returned from the traction substation TSa or the traction substation TSb to the power grid meets the preset requirement.
2. The system for bilateral power supply ride-through of the traction network according to claim 1, wherein: the traction substation TSa adopts in-phase power supply, a traction bus TSBa of the traction substation TSa supplies power to the traction network OCS through a traction feeder Fa1, the traction network OCSA supplies power to the left adjacent power supply section traction network OCSA through a traction feeder Fa2, and the traction network OCS is connected with the left adjacent power supply section traction network OCSA through a sectionalizer.
3. The system for bilateral power supply ride-through of the traction network according to claim 1, wherein: the traction substation TSb adopts in-phase power supply, a traction bus TSBb of the traction substation TSb supplies power to the traction network OCS through a traction feeder Fb1, the traction network OCS supplies power to the right adjacent power supply section traction network OCSB through a traction feeder Fb2, and the traction network OCS is connected with the right adjacent power supply section traction network OCSB through a sectionalizer.
4. The system for bilateral power supply ride-through of the traction network according to claim 1, wherein: the power conversion device BCSa comprises a rectifying device ADCa and an inverter device DACa, the direct current side of the rectifying device ADCa is connected with the energy storage device ESDa and the direct current side of the inverter device DACa through a common direct current bus DCBa, the three-phase current side of the inverter device DACa is connected with a power distribution system bus DSBa of the traction substation TSa, and the output end of the controller CCa is connected with the control end of the power conversion device BCSa.
5. The system for bilateral power supply ride-through of the traction network according to claim 1, wherein: the power conversion device BCSb comprises a rectifying device ADCb and an inverting device DACb, the direct current side of the rectifying device ADCb is connected with the energy storage device ESDb and the direct current side of the inverting device DACb through a common direct current bus DCBb, the three-phase current side of the inverting device DACb is connected with a power distribution system bus DSBb of the traction substation TSb, and the output end of the controller CCb is connected with the control end of the power conversion device BCSb.
6. A control method of a traction network bilateral power supply ride-through power utilization system based on any one of claims 1 to 5, characterized in that: the method comprises the following steps:
the controller CCa and the controller CCb respectively acquire real-time power information of the traction substation TSa and the traction substation TSb;
the controller CCa and the controller CCb carry out information interaction according to the acquired real-time power information;
the controller CCa controls the power conversion device BCSa to utilize the crossing power according to the information interaction result, and the controller CCb controls the power conversion device BCSb to utilize the crossing power according to the information interaction result, so that the crossing power returned from the traction substation TSa to the power grid or the crossing power returned from the traction substation TSb to the power grid meets the preset requirement.
7. The control method according to claim 6, characterized in that: the traction substation TSa and the traction substation TSb both adopt the same-phase power supply, and the control method comprises the following steps:
the step of acquiring the real-time power information of the traction substation TSa by the controller CCa comprises the following steps: the controller CCa detects the voltage Ua of the traction bus TSBa, the current Ia1 of the traction feeder Fa1 and the current Ia2 of the traction feeder Fa2 in real time; the controller CCa calculates active power Pca provided by the traction substation TSa to the traction network OCS according to the voltage Ua of the traction bus TSBa and the current Ia1 of the traction feeder Fa 1; the controller CCa calculates active power Pcaa provided by the traction substation TSa to the left adjacent power supply section traction network OCSA according to the voltage Ua of the traction bus TSBa and the current Ia2 of the traction feeder Fa 2;
the step of acquiring the real-time power information of the substation TSb by the controller CCb comprises the following steps: the controller CCb detects the voltage Ub of the traction bus TSBb, the current Ib1 of the traction feeder Fb1 and the current Ib2 of the traction feeder Fb2 in real time; the controller CCb calculates active power Pcb provided by the traction substation TSb to the traction network OCS according to the voltage Ub of the traction bus TSBb and the current Ib1 of the traction feeder Fb1, and the controller CCb calculates active power Pcbb provided by the traction substation TSb to the traction network OCSB in the right adjacent power supply section according to the voltage Ub of the traction bus TSBb and the current Ib2 of the traction feeder Fb 2;
the power flowing to the traction network by the traction substation is positive, and the power flowing to the traction substation by the traction network is negative.
8. The control method according to claim 7, characterized in that:
the information interaction between the controller CCa and the controller CCb according to the acquired real-time power information comprises the following steps: the controller CCa sends the active power Pca and the active power Pcaa data to the controller CCb through the optical fiber pair OFL, and the controller CCb sends the active power Pcb and the active power Pcbb data to the controller CCa through the optical fiber pair OFL.
9. The control method according to claim 6, characterized in that: the controller CCa controls the power conversion device BCSa to utilize the crossing power according to the information interaction result, and the controller CCb controls the power conversion device BCSb to utilize the crossing power according to the information interaction result, so that the crossing power returned from the traction substation TSa to the power grid or the crossing power returned from the traction substation TSb to the power grid meets the preset requirement and comprises the following steps:
if Pca >0 and Pcb <0 and Pca + Pcb =0, the controller CCa and controller CCb determine that the traction network OCS is in the idle condition, the active power Pca and the active power Pcb are ride-through power and flow from the traction feeder Fa1 to the traction feeder Fb1, when: if the active power Pca is more than or equal to Pcbb and more than or equal to 0, the controller CCb controls the power conversion device BCSb to supply power to the distribution system bus DSBb or enables the energy storage device ESDb to operate in an energy storage state, the sum of the power of the controller CCb and the power of the energy storage device ESDb is = Pca-Pcbb, and meanwhile the controller CCa controls the power conversion device BCSa to be in standby; if the active power Pcbb is larger than or equal to Pca, the controller CCb controls the power conversion device BCSb to be in standby, and meanwhile, the controller CCa controls the power conversion device BCSa to be in standby;
if Pcb >0 and Pca <0 and Pca + Pcb =0, controller CCa and controller CCb determine that the traction network OCS is in the idle condition, active power Pca and active power Pcb are ride-through power and flow from traction feed Fb1 to traction feed Fa1, when: if the active power Pcb is larger than or equal to Paaa and larger than or equal to 0, the controller CCa controls the power conversion device BCSa to supply power to the power distribution system bus DSBa or enables the energy storage device ESDa to operate in an energy storage state, the sum of the power of the controller CCa and the power storage device ESDa is = Pb-Paaa, and meanwhile the controller CCb controls the power conversion device BCSb to be in a standby state; if the active power Pcaa is larger than or equal to Pcb, the controller CCa controls the power conversion device BCSa to stand by, and meanwhile, the controller CCb controls the power conversion device BCSb to stand by;
if the absolute value of Pca + Pcb is greater than 0, and Pca is greater than 0 and Pcb is greater than 0, the controller CCa and the controller CCb judge that the OCS is in the traction working condition, the controller CCa controls the power conversion device BCSa to enable the energy storage device ESDa to operate in the discharge state, the discharge power of the energy storage device ESDa is less than or equal to Pca, meanwhile, the controller CCb controls the power conversion device BCSb to enable the energy storage device ESDb to operate in the discharge state, and the discharge power of the energy storage device ESDb is less than or equal to Pcb.
10. The control method according to claim 9, characterized in that: the controller CCa controls the power conversion device BCSa to utilize the cross power according to the information interaction result, and the controller CCb controls the power conversion device BCSb to utilize the cross power according to the information interaction result, so that the cross power returned from the traction substation TSa to the grid or the cross power returned from the traction substation TSb to the grid meets the preset requirement, further comprising:
if Pca <0 and Pcb <0, controller CCa and controller CCb determine that the OCS is in the braking condition, at which time:
if Pcaa is less than 0, the controller CCa controls the power conversion device BCSa to supply power to the distribution system bus DSBa or to enable the energy storage device ESDa to operate in an energy storage state, and the sum of the power of the two is = | Pca | + | Pcaa |; if Pcaa >0 and Pcaa < | Pcaa |, the controller CCa controls the power conversion device BCSa to supply power to the distribution system bus DSBa or to operate the energy storage device ESDa in an energy storage state, and the sum of the power of the two is = | Pcaa | - | Pcaa |; if Pcaa is greater than 0 and Pcaa is greater than or equal to | Pca |, the controller CCa controls the power conversion device BCSa to be in standby;
if Pcbb is less than 0, the controller CCb controls the power conversion device BCSb to supply power to the distribution system bus DSBb or enables the energy storage device ESDb to operate in an energy storage state, and the sum of the power conversion device BCSb and the energy storage device ESDb is = | Pcb | + | Pcbb |; if Pcbb is greater than 0 and Pcbb is less than | Pcb |, the controller CCb controls the power conversion device BCSb to supply power to the distribution system bus DSBb or enables the energy storage device ESDb to operate in an energy storage state, and the sum of the power of the two is = | Pcb | - | Pcbb |; if Pcbb is larger than 0 and Pcbb is larger than or equal to | Pcb |, the controller CCb controls the power conversion device BCSa to be in standby.
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| PCT/CN2022/132262 WO2023173783A1 (en) | 2022-03-17 | 2022-11-16 | Traction network bilateral power supply ride-through power utilization system, and control method |
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